1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
|
Unit CanvasFontManager;
{$mode objfpc}{$H+}
interface
uses
Classes
,fpg_base
,fpg_main
,fpg_widget
;
Const
// This defines the fraction of a pixel that
// font character widths will be given in
DefaultTopicFontName = 'Arial';
DefaultTopicFontSize: integer = 10;
DefaultTopicFixedFontName = 'Courier New';
DefaultTopicFixedFontSize: integer = 10;
var
DefaultTopicFont: string;
DefaultTopicFixedFont: string;
type
{Standard Font Attributes}
TFontAttributes = set of (faBold, faItalic, faUnderScore, faOutline, faStrikeOut);
{Standard Font pitches}
TFontPitch=(fpFixed,fpProportional);
TCanvasFontManager = class(TObject)
private
FWidget: TfpgWidget;
FCanvas: TfpgCanvas;
function GetCurrentFont: TfpgFont;
procedure SetDefaultFont(const AValue: TfpgFont);
protected
FDefaultFont: TfpgFont;
public
constructor Create(ACanvas: TfpgCanvas; AWidget: TfpgWidget); reintroduce;
destructor Destroy; override;
function AverageCharWidth: longint;
function CharDescender: longint;
function CharHeight: longint;
function CharWidth( const C: Char ): longint; // Retrieve the width of the given char, in the current font
function IsFixed: boolean;
function MaximumCharWidth: longint;
procedure DrawString(var Point: TPoint; const Length: longint; const S: PChar);
procedure SetFont(const AFontDesc: TfpgString);
property Canvas: TfpgCanvas read FCanvas;
property CurrentFont: TfpgFont read GetCurrentFont;
property DefaultFont: TfpgFont read FDefaultFont write SetDefaultFont;
property Widget: TfpgWidget read FWidget;
end;
// Get the font attributes of a fpGUI font
function GetFPGuiFontAttributes(const AFont: TfpgFont): TFontAttributes;
function GetFPGuiFont(const AFontNameSize: string; const Attrs: TFontAttributes): TfpgFont;
procedure ApplyFontAttributes(var AFontDesc: string; const Attrs: TFontAttributes);
implementation
uses
SysUtils
,ACLStringUtility
,nvUtilities
,fpg_stringutils
,SettingsUnit
;
function GetFPGuiFontAttributes(const AFont: TfpgFont): TFontAttributes;
var
s: string;
facename: string;
cp: integer;
c: char;
token: string;
prop, propval: string;
lDesc: string;
lFontSize: integer;
function NextC: char;
begin
Inc(cp);
if cp > length(lDesc) then
c := #0
else
c := lDesc[cp];
Result := c;
end;
procedure NextToken;
begin
token := '';
while (c <> #0) and (c in [' ', 'a'..'z', 'A'..'Z', '_', '0'..'9']) do
begin
token := token + c;
NextC;
end;
end;
begin
Result := [];
cp := 0;
lDesc := AFont.FontDesc;
// find fontface
NextC;
NextToken;
// find font size
if c = '-' then
begin
NextC;
NextToken;
lFontSize := StrToIntDef(token, DefaultTopicFontSize);
end;
// find font attributes
while c = ':' do
begin
NextC;
NextToken;
prop := UpperCase(token);
propval := '';
if c = '=' then
begin
NextC;
NextToken;
propval := UpperCase(token);
end;
// convert fontdesc attributes to standard font attributes
if prop = 'BOLD' then
include(Result, faBold)
else if prop = 'ITALIC' then
include(Result, faItalic)
else if prop = 'UNDERLINE' then
include(Result, faUnderScore)
else if prop = 'OUTLINE' then
include(Result, faOutline)
else if prop = 'STRIKEOUT' then
include(Result, faStrikeOut)
end;
end;
function GetFPGuiFont(const AFontNameSize: string; const Attrs: TFontAttributes): TfpgFont;
var
s: string;
begin
s := AFontNameSize;
ApplyFontAttributes(s, Attrs);
Result := fpgGetFont(s);
end;
// Add attributes to font name
procedure ApplyFontAttributes(var AFontDesc: string; const Attrs: TFontAttributes);
begin
if faItalic in Attrs then
if Pos(':Italic', AFontDesc) = 0 then
AFontDesc := AFontDesc + ':Italic';
if faBold in Attrs then
if Pos(':Bold', AFontDesc) = 0 then
AFontDesc := AFontDesc + ':Bold';
if faOutline in Attrs Then
if Pos(':Outline', AFontDesc) = 0 then
AFontDesc := AFontDesc + ':Outline';
if faStrikeOut in Attrs Then
if Pos(':Strikeout', AFontDesc) = 0 then
AFontDesc := AFontDesc + ':Strikeout';
if faUnderScore in Attrs Then
if Pos(':Underscore', AFontDesc) = 0 then
AFontDesc := AFontDesc + ':Underscore';
end;
// Provide font name substitutes for some common bitmap fonts found in INF files
function SubstituteBitmapFontToOutline( const FaceName: string ): string;
begin
if StringsSame( FaceName, 'Helv' ) then
result := DefaultTopicFontName
else if StringsSame( FaceName, 'Helvetica' ) then
result := DefaultTopicFontName
else if StringsSame( FaceName, 'Tms Rmn' ) then
result := 'Times New Roman'
else if StringsSame( FaceName, 'System Proportional' ) then
result := DefaultTopicFontName
else if StringsSame( FaceName, 'System Monospaced' ) then
result := DefaultTopicFixedFontName
else if StringsSame( FaceName, 'System VIO' ) then
result := DefaultTopicFixedFontName
else
result := FaceName; // no substitution
end;
// Look for the best match for the given face, size and attributes.
// If FixedWidth is set then makes sure that the result is fixed
procedure FindBestFontMatch( const FaceName: string; const PointSize: longint;
const Attributes: TFontAttributes; const FixedWidth: boolean; var FontDesc: string );
var
sl: TStringList;
i: integer;
begin
FontDesc := '';
sl := fpgApplication.GetFontFaceList;
for i := 0 to sl.Count-1 do
begin
if Pos(FaceName, sl[i]) > 0 then
FontDesc := sl[i] + '-' + IntToStr(PointSize);
end;
ApplyFontAttributes(FontDesc, Attributes);
// if nothing found, use default font of fpGUI
if FontDesc = '' then
FontDesc := fpgApplication.DefaultFont.FontDesc;
end;
{ TCanvasFontManager }
constructor TCanvasFontManager.Create(ACanvas: TfpgCanvas; AWidget: TfpgWidget);
begin
inherited Create;
FCanvas := ACanvas;
FWidget := AWidget;
FDefaultFont := fpgGetFont(DefaultTopicFont);
FCanvas.Font := FDefaultFont;
end;
destructor TCanvasFontManager.Destroy;
begin
FCanvas.Font := fpgApplication.DefaultFont;
FDefaultFont.Free;
inherited Destroy;
end;
procedure TCanvasFontManager.SetDefaultFont(const AValue: TfpgFont);
begin
if FDefaultFont = AValue then
exit;
FDefaultFont.Free;
FDefaultFont := AValue;
end;
function TCanvasFontManager.GetCurrentFont: TfpgFont;
begin
Result := FCanvas.Font as TfpgFont;
end;
// Set the current font for the canvas to match the given
// spec, creating or re-using fonts as needed.
procedure TCanvasFontManager.SetFont(const AFontDesc: TfpgString);
begin
if FCanvas.Font.FontDesc = AFontDesc then
Exit; // nothing to do so exit
if FDefaultFont.FontDesc = AFontDesc then
begin
FCanvas.Font := FDefaultFont;
Exit;
end;
FCanvas.Font := fpgGetFont(AFontDesc);
end;
function TCanvasFontManager.CharWidth( const C: Char ): longint;
begin
Result := FCanvas.Font.TextWidth(C);
end;
function TCanvasFontManager.AverageCharWidth: longint;
begin
Result := FCanvas.Font.TextWidth('c');
end;
function TCanvasFontManager.MaximumCharWidth: longint;
begin
Result := FCanvas.Font.TextWidth('W');
end;
function TCanvasFontManager.CharHeight: longint;
begin
Result := FCanvas.Font.Height;
end;
function TCanvasFontManager.CharDescender: longint;
begin
Result := FCanvas.Font.Descent;
end;
function TCanvasFontManager.IsFixed: boolean;
begin
Result := FCanvas.Font.IsFixedWidth;
end;
procedure TCanvasFontManager.DrawString(var Point: TPoint; const Length: longint; const S: PChar);
var
t: TfpgString;
begin
t := s;
//case Settings.Encoding of
// encUTF8: t := IPFToUTF8(t);
// encCP437: t := CP437ToUTF8(t);
// encCP850: t := CP850ToUTF8(t);
// encIBMGraph: t := IBMGraphToUTF8(t);
//else
// t := IPFToUTF8(t);
//end;
FCanvas.DrawString(Point.X, Point.Y, t);
Point.x := Point.X + Canvas.Font.TextWidth(t);
end;
initialization
DefaultTopicFont := DefaultTopicFontName + '-' + IntToStr(DefaultTopicFontSize);
DefaultTopicFixedFont := DefaultTopicFixedFontName + '-' + IntToStr(DefaultTopicFixedFontSize);
end.
|